Move optional.h to webrtc/api/

webrtc/api/video_codecs/video_encoder.h

 /*
  *  Copyright (c) 2014 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_API_VIDEO_CODECS_VIDEO_ENCODER_H_
 #define WEBRTC_API_VIDEO_CODECS_VIDEO_ENCODER_H_
 
 #include <memory>
 #include <string>
 #include <vector>
 
+#include "webrtc/api/optional.h"
 #include "webrtc/api/video/video_frame.h"
 #include "webrtc/common_types.h"
 #include "webrtc/common_video/include/video_frame.h"
 #include "webrtc/rtc_base/checks.h"
-#include "webrtc/rtc_base/optional.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
 
 class RTPFragmentationHeader;
 // TODO(pbos): Expose these through a public (root) header or change these APIs.
 struct CodecSpecificInfo;
 class VideoCodec;
 
 class EncodedImageCallback {
@@ skipping 141 matching lines @@
   // Any encoder implementation wishing to use the WebRTC provided
   // quality scaler must implement this method.
   virtual ScalingSettings GetScalingSettings() const;
 
   virtual int32_t SetPeriodicKeyFrames(bool enable);
   virtual bool SupportsNativeHandle() const;
   virtual const char* ImplementationName() const;
 };
 }  // namespace webrtc
 #endif  // WEBRTC_API_VIDEO_CODECS_VIDEO_ENCODER_H_